Pneumatic Tire Working-Layer Width for Higher EV Load Capacity
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Solution Overview
Problem
Existing tires struggle to support the increased weight of electric vehicles due to battery requirements without compromising vehicle habitability, compactness, and comfort, as increasing tire size or pressure leads to undesirable effects like reduced interior space, increased noise, and discomfort.
Innovation Solution
A tire design with a higher load rating than standard EXTRA-LOAD tires, achieved by optimizing the axial width of the working layer and rim width ratio, which maintains the same size and comfort while enhancing load capacity, and incorporating a single or dual layer carcass reinforcement to manage energy dissipation and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tire size is increased to bear heavier load, then load capacity is improved, but interior space is reduced and vehicle exterior size is enlarged
Solution Approach 1:
The patent changes the structural parameters of the tire by optimizing the axial width of the working layer (T2) relative to the rim width (A), ensuring T2/A ≤ 1.00. This parameter optimization allows the tire to achieve higher load ratings (LI ≥ LI′+1) without increasing the overall tire size, thereby maintaining vehicle interior space while enhancing load capacity to support electric vehicle weights.
2Strength
If tire size is increased to bear heavier load, then load capacity is improved, but exterior noise is increased
Solution Approach 1:
By optimizing the working layer axial width parameter (T2) and controlling the T2/A ratio to be ≤ 1.00, the patent enables the tire to achieve higher load capacity without increasing tire dimensions. This prevents the increase in exterior noise that would otherwise result from larger tire size, while still providing the necessary load-bearing capability for electric vehicles.
3Strength
If recommended pressure is increased to bear heavier load, then load capacity is improved, but passenger comfort is reduced
Solution Approach 1:
The patent changes the structural parameters of the tire by optimizing the working layer axial width (T2) and controlling the T2/A ratio (≤ 1.00), which enables the tire to achieve higher load ratings without increasing the recommended inflation pressure. This maintains passenger comfort while enhancing load capacity to support electric vehicle weights.
4Strength
If tire size is increased to bear heavier load, then load capacity is improved, but rolling resistance is increased
Solution Approach 1:
By optimizing the working layer axial width parameter (T2) and controlling the T2/A ratio to be ≤ 1.00, the patent enables the tire to achieve higher load capacity without increasing tire dimensions. This prevents the increase in rolling resistance that would otherwise result from larger tire size, while still providing the necessary load-bearing capability for electric vehicles.
Data Source
AI summary
The fitted assembly (10) comprises a tire (11) for a passenger vehicle comprising a working layer (26) which is axially the least wide, the working layer (26) which is axially the least wide having an axial width T2 expressed in mm. The fitted assembly (10) comprises a fitting support (100) comprising a rim (200) with a rim width A according to the manual of the ETRTO 2019 standard, and expressed in mm. The tire (11) has a load rating LI such that LI≥LI′+1, LI′ being the load rating of an EXTRA LOAD tire with the same size according to the manual of the ETRTO 2019 standard. The ratio T2/A is such that T2/A≤1.00.